Title: Apparatus for cleaning exhaust gas for an internal combustion engine

Abstract: Disclosed herein is an apparatus for cleaning the exhaust gas of an internal combustion engine, which apparatus includes an exhaust gas recirculation system provided with a back-pressure control mechanism for maintaining a predetermined constant pressure of recirculated exhaust gas in a recirculation passageway, and an air injection system connecting an air pump with an exhaust system of the engine. An air-flow control valve having two vacuum chambers arranged between the air injection system and the exhaust gas recirculation system for controlling, in two stages, the amount of air diverted from the air injection system to the recirculation passageway. One of the chambers is directly connected to a vacuum source in the intake system of the engine. While the other is connected, via a vacuum delay unit, to the vacuum source.

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Inventors: Wakita, Nobuaki (Susono, JP)
Hashimoto, Eiji (Susono, JP)

Application Number: 910097
Filing Date: 1978-05-30
Publication_date: 1979-12-11
Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota, JP)
Primary Class(es): 60/278
Other Classes:
US Patent Ref:

3765210	Sep, 1978	Kuehl	72/164.
3799131	Mar, 1974	Bolton	123/119.
3802402	Apr, 1974	Swatman	123/119.
3983697	Oct, 1976	Goto	60/278.
4088101	May, 1973	Wakita	123/119.

Other Refs:
Primary Examiner: Hart, Douglas
Assistant Examiner:
Attorney: Kenyon & Kenyon